1 /*- 2 * Copyright (c) 1982, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 30 * $FreeBSD$ 31 */ 32 33 #include "opt_atalk.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 #include "opt_ipx.h" 37 #include "opt_bdg.h" 38 #include "opt_mac.h" 39 #include "opt_netgraph.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/mac.h> 45 #include <sys/malloc.h> 46 #include <sys/module.h> 47 #include <sys/mbuf.h> 48 #include <sys/random.h> 49 #include <sys/socket.h> 50 #include <sys/sockio.h> 51 #include <sys/sysctl.h> 52 53 #include <net/if.h> 54 #include <net/if_arp.h> 55 #include <net/netisr.h> 56 #include <net/route.h> 57 #include <net/if_llc.h> 58 #include <net/if_dl.h> 59 #include <net/if_types.h> 60 #include <net/bpf.h> 61 #include <net/ethernet.h> 62 #include <net/bridge.h> 63 #include <net/if_vlan_var.h> 64 65 #if defined(INET) || defined(INET6) 66 #include <netinet/in.h> 67 #include <netinet/in_var.h> 68 #include <netinet/if_ether.h> 69 #include <netinet/ip_fw.h> 70 #include <netinet/ip_dummynet.h> 71 #endif 72 #ifdef INET6 73 #include <netinet6/nd6.h> 74 #endif 75 76 #ifdef IPX 77 #include <netipx/ipx.h> 78 #include <netipx/ipx_if.h> 79 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); 80 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, 81 struct sockaddr *dst, short *tp, int *hlen); 82 #endif 83 84 #ifdef NETATALK 85 #include <netatalk/at.h> 86 #include <netatalk/at_var.h> 87 #include <netatalk/at_extern.h> 88 89 #define llc_snap_org_code llc_un.type_snap.org_code 90 #define llc_snap_ether_type llc_un.type_snap.ether_type 91 92 extern u_char at_org_code[3]; 93 extern u_char aarp_org_code[3]; 94 #endif /* NETATALK */ 95 96 /* netgraph node hooks for ng_ether(4) */ 97 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 98 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 99 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 100 void (*ng_ether_attach_p)(struct ifnet *ifp); 101 void (*ng_ether_detach_p)(struct ifnet *ifp); 102 103 void (*vlan_input_p)(struct ifnet *, struct mbuf *); 104 105 /* bridge support */ 106 int do_bridge; 107 bridge_in_t *bridge_in_ptr; 108 bdg_forward_t *bdg_forward_ptr; 109 bdgtakeifaces_t *bdgtakeifaces_ptr; 110 struct bdg_softc *ifp2sc; 111 112 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 113 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 114 115 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 116 struct sockaddr *); 117 118 #define senderr(e) do { error = (e); goto bad;} while (0) 119 120 #if defined(INET) || defined(INET6) 121 int 122 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 123 struct ip_fw **rule, int shared); 124 static int ether_ipfw; 125 #endif 126 127 /* 128 * Ethernet output routine. 129 * Encapsulate a packet of type family for the local net. 130 * Use trailer local net encapsulation if enough data in first 131 * packet leaves a multiple of 512 bytes of data in remainder. 132 * Assumes that ifp is actually pointer to arpcom structure. 133 */ 134 int 135 ether_output(struct ifnet *ifp, struct mbuf *m, 136 struct sockaddr *dst, struct rtentry *rt0) 137 { 138 short type; 139 int error, hdrcmplt = 0; 140 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN]; 141 struct ether_header *eh; 142 int loop_copy = 0; 143 int hlen; /* link layer header length */ 144 145 #ifdef MAC 146 error = mac_check_ifnet_transmit(ifp, m); 147 if (error) 148 senderr(error); 149 #endif 150 151 if (ifp->if_flags & IFF_MONITOR) 152 senderr(ENETDOWN); 153 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 154 senderr(ENETDOWN); 155 156 hlen = ETHER_HDR_LEN; 157 switch (dst->sa_family) { 158 #ifdef INET 159 case AF_INET: 160 error = arpresolve(ifp, rt0, m, dst, edst); 161 if (error) 162 return (error == EWOULDBLOCK ? 0 : error); 163 type = htons(ETHERTYPE_IP); 164 break; 165 case AF_ARP: 166 { 167 struct arphdr *ah; 168 ah = mtod(m, struct arphdr *); 169 ah->ar_hrd = htons(ARPHRD_ETHER); 170 171 loop_copy = -1; /* if this is for us, don't do it */ 172 173 switch(ntohs(ah->ar_op)) { 174 case ARPOP_REVREQUEST: 175 case ARPOP_REVREPLY: 176 type = htons(ETHERTYPE_REVARP); 177 break; 178 case ARPOP_REQUEST: 179 case ARPOP_REPLY: 180 default: 181 type = htons(ETHERTYPE_ARP); 182 break; 183 } 184 185 if (m->m_flags & M_BCAST) 186 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN); 187 else 188 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN); 189 190 } 191 break; 192 #endif 193 #ifdef INET6 194 case AF_INET6: 195 error = nd6_storelladdr(ifp, rt0, m, dst, (u_char *)edst); 196 if (error) 197 return error; 198 type = htons(ETHERTYPE_IPV6); 199 break; 200 #endif 201 #ifdef IPX 202 case AF_IPX: 203 if (ef_outputp) { 204 error = ef_outputp(ifp, &m, dst, &type, &hlen); 205 if (error) 206 goto bad; 207 } else 208 type = htons(ETHERTYPE_IPX); 209 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 210 (caddr_t)edst, sizeof (edst)); 211 break; 212 #endif 213 #ifdef NETATALK 214 case AF_APPLETALK: 215 { 216 struct at_ifaddr *aa; 217 218 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) 219 senderr(EHOSTUNREACH); /* XXX */ 220 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) 221 return (0); 222 /* 223 * In the phase 2 case, need to prepend an mbuf for the llc header. 224 */ 225 if ( aa->aa_flags & AFA_PHASE2 ) { 226 struct llc llc; 227 228 M_PREPEND(m, LLC_SNAPFRAMELEN, M_TRYWAIT); 229 if (m == NULL) 230 senderr(ENOBUFS); 231 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 232 llc.llc_control = LLC_UI; 233 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 234 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 235 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); 236 type = htons(m->m_pkthdr.len); 237 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN; 238 } else { 239 type = htons(ETHERTYPE_AT); 240 } 241 break; 242 } 243 #endif /* NETATALK */ 244 245 case pseudo_AF_HDRCMPLT: 246 hdrcmplt = 1; 247 eh = (struct ether_header *)dst->sa_data; 248 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 249 /* FALLTHROUGH */ 250 251 case AF_UNSPEC: 252 loop_copy = -1; /* if this is for us, don't do it */ 253 eh = (struct ether_header *)dst->sa_data; 254 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 255 type = eh->ether_type; 256 break; 257 258 default: 259 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 260 senderr(EAFNOSUPPORT); 261 } 262 263 /* 264 * Add local net header. If no space in first mbuf, 265 * allocate another. 266 */ 267 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 268 if (m == NULL) 269 senderr(ENOBUFS); 270 eh = mtod(m, struct ether_header *); 271 (void)memcpy(&eh->ether_type, &type, 272 sizeof(eh->ether_type)); 273 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 274 if (hdrcmplt) 275 (void)memcpy(eh->ether_shost, esrc, 276 sizeof(eh->ether_shost)); 277 else 278 (void)memcpy(eh->ether_shost, IFP2AC(ifp)->ac_enaddr, 279 sizeof(eh->ether_shost)); 280 281 /* 282 * If a simplex interface, and the packet is being sent to our 283 * Ethernet address or a broadcast address, loopback a copy. 284 * XXX To make a simplex device behave exactly like a duplex 285 * device, we should copy in the case of sending to our own 286 * ethernet address (thus letting the original actually appear 287 * on the wire). However, we don't do that here for security 288 * reasons and compatibility with the original behavior. 289 */ 290 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 291 int csum_flags = 0; 292 293 if (m->m_pkthdr.csum_flags & CSUM_IP) 294 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 295 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 296 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 297 298 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 299 struct mbuf *n; 300 301 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 302 n->m_pkthdr.csum_flags |= csum_flags; 303 if (csum_flags & CSUM_DATA_VALID) 304 n->m_pkthdr.csum_data = 0xffff; 305 (void)if_simloop(ifp, n, dst->sa_family, hlen); 306 } else 307 ifp->if_iqdrops++; 308 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 309 ETHER_ADDR_LEN) == 0) { 310 m->m_pkthdr.csum_flags |= csum_flags; 311 if (csum_flags & CSUM_DATA_VALID) 312 m->m_pkthdr.csum_data = 0xffff; 313 (void) if_simloop(ifp, m, dst->sa_family, hlen); 314 return (0); /* XXX */ 315 } 316 } 317 318 /* Handle ng_ether(4) processing, if any */ 319 if (ng_ether_output_p != NULL) { 320 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 321 bad: if (m != NULL) 322 m_freem(m); 323 return (error); 324 } 325 if (m == NULL) 326 return (0); 327 } 328 329 /* Continue with link-layer output */ 330 return ether_output_frame(ifp, m); 331 } 332 333 /* 334 * Ethernet link layer output routine to send a raw frame to the device. 335 * 336 * This assumes that the 14 byte Ethernet header is present and contiguous 337 * in the first mbuf (if BRIDGE'ing). 338 */ 339 int 340 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 341 { 342 #if defined(INET) || defined(INET6) 343 struct ip_fw *rule = ip_dn_claim_rule(m); 344 #else 345 void *rule = NULL; 346 #endif 347 int error; 348 349 if (rule == NULL && BDG_ACTIVE(ifp)) { 350 /* 351 * Beware, the bridge code notices the null rcvif and 352 * uses that identify that it's being called from 353 * ether_output as opposd to ether_input. Yech. 354 */ 355 m->m_pkthdr.rcvif = NULL; 356 m = bdg_forward_ptr(m, ifp); 357 if (m != NULL) 358 m_freem(m); 359 return (0); 360 } 361 #if defined(INET) || defined(INET6) 362 if (IPFW_LOADED && ether_ipfw != 0) { 363 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) { 364 if (m) { 365 m_freem(m); 366 return EACCES; /* pkt dropped */ 367 } else 368 return 0; /* consumed e.g. in a pipe */ 369 } 370 } 371 #endif 372 373 /* 374 * Queue message on interface, update output statistics if 375 * successful, and start output if interface not yet active. 376 */ 377 IFQ_HANDOFF(ifp, m, error); 378 return (error); 379 } 380 381 #if defined(INET) || defined(INET6) 382 /* 383 * ipfw processing for ethernet packets (in and out). 384 * The second parameter is NULL from ether_demux, and ifp from 385 * ether_output_frame. This section of code could be used from 386 * bridge.c as well as long as we use some extra info 387 * to distinguish that case from ether_output_frame(); 388 */ 389 int 390 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 391 struct ip_fw **rule, int shared) 392 { 393 struct ether_header *eh; 394 struct ether_header save_eh; 395 struct mbuf *m; 396 int i; 397 struct ip_fw_args args; 398 399 if (*rule != NULL && fw_one_pass) 400 return 1; /* dummynet packet, already partially processed */ 401 402 /* 403 * I need some amt of data to be contiguous, and in case others need 404 * the packet (shared==1) also better be in the first mbuf. 405 */ 406 m = *m0; 407 i = min( m->m_pkthdr.len, max_protohdr); 408 if ( shared || m->m_len < i) { 409 m = m_pullup(m, i); 410 if (m == NULL) { 411 *m0 = m; 412 return 0; 413 } 414 } 415 eh = mtod(m, struct ether_header *); 416 save_eh = *eh; /* save copy for restore below */ 417 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */ 418 419 args.m = m; /* the packet we are looking at */ 420 args.oif = dst; /* destination, if any */ 421 args.rule = *rule; /* matching rule to restart */ 422 args.next_hop = NULL; /* we do not support forward yet */ 423 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 424 i = ip_fw_chk_ptr(&args); 425 m = args.m; 426 if (m != NULL) { 427 /* 428 * Restore Ethernet header, as needed, in case the 429 * mbuf chain was replaced by ipfw. 430 */ 431 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 432 if (m == NULL) { 433 *m0 = m; 434 return 0; 435 } 436 if (eh != mtod(m, struct ether_header *)) 437 bcopy(&save_eh, mtod(m, struct ether_header *), 438 ETHER_HDR_LEN); 439 } 440 *m0 = m; 441 *rule = args.rule; 442 443 if (i == IP_FW_DENY) /* drop */ 444 return 0; 445 446 KASSERT(m != NULL, ("ether_ipfw_chk: m is NULL")); 447 448 if (i == IP_FW_PASS) /* a PASS rule. */ 449 return 1; 450 451 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { 452 /* 453 * Pass the pkt to dummynet, which consumes it. 454 * If shared, make a copy and keep the original. 455 */ 456 if (shared) { 457 m = m_copypacket(m, M_DONTWAIT); 458 if (m == NULL) 459 return 0; 460 } else { 461 /* 462 * Pass the original to dummynet and 463 * nothing back to the caller 464 */ 465 *m0 = NULL ; 466 } 467 ip_dn_io_ptr(m, dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 468 return 0; 469 } 470 /* 471 * XXX at some point add support for divert/forward actions. 472 * If none of the above matches, we have to drop the pkt. 473 */ 474 return 0; 475 } 476 #endif 477 478 /* 479 * Process a received Ethernet packet; the packet is in the 480 * mbuf chain m with the ethernet header at the front. 481 */ 482 static void 483 ether_input(struct ifnet *ifp, struct mbuf *m) 484 { 485 struct ether_header *eh; 486 u_short etype; 487 488 /* 489 * Do consistency checks to verify assumptions 490 * made by code past this point. 491 */ 492 if ((m->m_flags & M_PKTHDR) == 0) { 493 if_printf(ifp, "discard frame w/o packet header\n"); 494 ifp->if_ierrors++; 495 m_freem(m); 496 return; 497 } 498 if (m->m_len < ETHER_HDR_LEN) { 499 /* XXX maybe should pullup? */ 500 if_printf(ifp, "discard frame w/o leading ethernet " 501 "header (len %u pkt len %u)\n", 502 m->m_len, m->m_pkthdr.len); 503 ifp->if_ierrors++; 504 m_freem(m); 505 return; 506 } 507 eh = mtod(m, struct ether_header *); 508 etype = ntohs(eh->ether_type); 509 if (m->m_pkthdr.len > 510 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 511 if_printf(ifp, "discard oversize frame " 512 "(ether type %x flags %x len %u > max %lu)\n", 513 etype, m->m_flags, m->m_pkthdr.len, 514 ETHER_MAX_FRAME(ifp, etype, 515 m->m_flags & M_HASFCS)); 516 ifp->if_ierrors++; 517 m_freem(m); 518 return; 519 } 520 if (m->m_pkthdr.rcvif == NULL) { 521 if_printf(ifp, "discard frame w/o interface pointer\n"); 522 ifp->if_ierrors++; 523 m_freem(m); 524 return; 525 } 526 #ifdef DIAGNOSTIC 527 if (m->m_pkthdr.rcvif != ifp) { 528 if_printf(ifp, "Warning, frame marked as received on %s\n", 529 m->m_pkthdr.rcvif->if_xname); 530 } 531 #endif 532 533 #ifdef MAC 534 /* 535 * Tag the mbuf with an appropriate MAC label before any other 536 * consumers can get to it. 537 */ 538 mac_create_mbuf_from_ifnet(ifp, m); 539 #endif 540 541 /* 542 * Give bpf a chance at the packet. 543 */ 544 BPF_MTAP(ifp, m); 545 546 if (ifp->if_flags & IFF_MONITOR) { 547 /* 548 * Interface marked for monitoring; discard packet. 549 */ 550 m_freem(m); 551 return; 552 } 553 554 /* If the CRC is still on the packet, trim it off. */ 555 if (m->m_flags & M_HASFCS) { 556 m_adj(m, -ETHER_CRC_LEN); 557 m->m_flags &= ~M_HASFCS; 558 } 559 560 ifp->if_ibytes += m->m_pkthdr.len; 561 562 /* Handle ng_ether(4) processing, if any */ 563 if (ng_ether_input_p != NULL) { 564 (*ng_ether_input_p)(ifp, &m); 565 if (m == NULL) 566 return; 567 } 568 569 /* Check for bridging mode */ 570 if (BDG_ACTIVE(ifp) ) 571 if ((m = bridge_in_ptr(ifp, m)) == NULL) 572 return; 573 574 /* First chunk of an mbuf contains good entropy */ 575 if (harvest.ethernet) 576 random_harvest(m, 16, 3, 0, RANDOM_NET); 577 ether_demux(ifp, m); 578 } 579 580 /* 581 * Upper layer processing for a received Ethernet packet. 582 */ 583 void 584 ether_demux(struct ifnet *ifp, struct mbuf *m) 585 { 586 struct ether_header *eh; 587 int isr; 588 u_short ether_type; 589 #if defined(NETATALK) 590 struct llc *l; 591 #endif 592 #if defined(INET) || defined(INET6) 593 struct ip_fw *rule = ip_dn_claim_rule(m); 594 #endif 595 596 KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer")); 597 598 eh = mtod(m, struct ether_header *); 599 ether_type = ntohs(eh->ether_type); 600 601 #if defined(INET) || defined(INET6) 602 if (rule) /* packet was already bridged */ 603 goto post_stats; 604 #endif 605 606 if (!(BDG_ACTIVE(ifp)) && 607 !(ether_type == ETHERTYPE_VLAN && ifp->if_nvlans > 0)) { 608 /* 609 * Discard packet if upper layers shouldn't see it because it 610 * was unicast to a different Ethernet address. If the driver 611 * is working properly, then this situation can only happen 612 * when the interface is in promiscuous mode. 613 * 614 * If VLANs are active, and this packet has a VLAN tag, do 615 * not drop it here but pass it on to the VLAN layer, to 616 * give them a chance to consider it as well (e. g. in case 617 * bridging is only active on a VLAN). They will drop it if 618 * it's undesired. 619 */ 620 if ((ifp->if_flags & IFF_PROMISC) != 0 621 && (eh->ether_dhost[0] & 1) == 0 622 && bcmp(eh->ether_dhost, 623 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0 624 && (ifp->if_flags & IFF_PPROMISC) == 0) { 625 m_freem(m); 626 return; 627 } 628 } 629 630 /* Discard packet if interface is not up */ 631 if ((ifp->if_flags & IFF_UP) == 0) { 632 m_freem(m); 633 return; 634 } 635 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 636 if (bcmp(etherbroadcastaddr, eh->ether_dhost, 637 sizeof(etherbroadcastaddr)) == 0) 638 m->m_flags |= M_BCAST; 639 else 640 m->m_flags |= M_MCAST; 641 } 642 if (m->m_flags & (M_BCAST|M_MCAST)) 643 ifp->if_imcasts++; 644 645 #if defined(INET) || defined(INET6) 646 post_stats: 647 if (IPFW_LOADED && ether_ipfw != 0) { 648 if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) { 649 if (m) 650 m_freem(m); 651 return; 652 } 653 } 654 #endif 655 656 /* 657 * If VLANs are configured on the interface, check to 658 * see if the device performed the decapsulation and 659 * provided us with the tag. 660 */ 661 if (ifp->if_nvlans && 662 m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL) != NULL) { 663 /* 664 * vlan_input() will either recursively call ether_input() 665 * or drop the packet. 666 */ 667 KASSERT(vlan_input_p != NULL,("ether_input: VLAN not loaded!")); 668 (*vlan_input_p)(ifp, m); 669 return; 670 } 671 672 /* 673 * Handle protocols that expect to have the Ethernet header 674 * (and possibly FCS) intact. 675 */ 676 switch (ether_type) { 677 case ETHERTYPE_VLAN: 678 if (ifp->if_nvlans != 0) { 679 KASSERT(vlan_input_p,("ether_input: VLAN not loaded!")); 680 (*vlan_input_p)(ifp, m); 681 } else { 682 ifp->if_noproto++; 683 m_freem(m); 684 } 685 return; 686 } 687 688 /* Strip off Ethernet header. */ 689 m_adj(m, ETHER_HDR_LEN); 690 691 /* If the CRC is still on the packet, trim it off. */ 692 if (m->m_flags & M_HASFCS) { 693 m_adj(m, -ETHER_CRC_LEN); 694 m->m_flags &= ~M_HASFCS; 695 } 696 697 switch (ether_type) { 698 #ifdef INET 699 case ETHERTYPE_IP: 700 if (ip_fastforward(m)) 701 return; 702 isr = NETISR_IP; 703 break; 704 705 case ETHERTYPE_ARP: 706 if (ifp->if_flags & IFF_NOARP) { 707 /* Discard packet if ARP is disabled on interface */ 708 m_freem(m); 709 return; 710 } 711 isr = NETISR_ARP; 712 break; 713 #endif 714 #ifdef IPX 715 case ETHERTYPE_IPX: 716 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 717 return; 718 isr = NETISR_IPX; 719 break; 720 #endif 721 #ifdef INET6 722 case ETHERTYPE_IPV6: 723 isr = NETISR_IPV6; 724 break; 725 #endif 726 #ifdef NETATALK 727 case ETHERTYPE_AT: 728 isr = NETISR_ATALK1; 729 break; 730 case ETHERTYPE_AARP: 731 isr = NETISR_AARP; 732 break; 733 #endif /* NETATALK */ 734 default: 735 #ifdef IPX 736 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 737 return; 738 #endif /* IPX */ 739 #if defined(NETATALK) 740 if (ether_type > ETHERMTU) 741 goto discard; 742 l = mtod(m, struct llc *); 743 if (l->llc_dsap == LLC_SNAP_LSAP && 744 l->llc_ssap == LLC_SNAP_LSAP && 745 l->llc_control == LLC_UI) { 746 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 747 sizeof(at_org_code)) == 0 && 748 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 749 m_adj(m, LLC_SNAPFRAMELEN); 750 isr = NETISR_ATALK2; 751 break; 752 } 753 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 754 sizeof(aarp_org_code)) == 0 && 755 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 756 m_adj(m, LLC_SNAPFRAMELEN); 757 isr = NETISR_AARP; 758 break; 759 } 760 } 761 #endif /* NETATALK */ 762 goto discard; 763 } 764 netisr_dispatch(isr, m); 765 return; 766 767 discard: 768 /* 769 * Packet is to be discarded. If netgraph is present, 770 * hand the packet to it for last chance processing; 771 * otherwise dispose of it. 772 */ 773 if (ng_ether_input_orphan_p != NULL) { 774 /* 775 * Put back the ethernet header so netgraph has a 776 * consistent view of inbound packets. 777 */ 778 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 779 (*ng_ether_input_orphan_p)(ifp, m); 780 return; 781 } 782 m_freem(m); 783 } 784 785 /* 786 * Convert Ethernet address to printable (loggable) representation. 787 * This routine is for compatibility; it's better to just use 788 * 789 * printf("%6D", <pointer to address>, ":"); 790 * 791 * since there's no static buffer involved. 792 */ 793 char * 794 ether_sprintf(const u_char *ap) 795 { 796 static char etherbuf[18]; 797 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":"); 798 return (etherbuf); 799 } 800 801 /* 802 * Perform common duties while attaching to interface list 803 */ 804 void 805 ether_ifattach(struct ifnet *ifp, const u_int8_t *llc) 806 { 807 int i; 808 struct ifaddr *ifa; 809 struct sockaddr_dl *sdl; 810 811 ifp->if_type = IFT_ETHER; 812 ifp->if_addrlen = ETHER_ADDR_LEN; 813 ifp->if_hdrlen = ETHER_HDR_LEN; 814 if_attach(ifp); 815 ifp->if_mtu = ETHERMTU; 816 ifp->if_output = ether_output; 817 ifp->if_input = ether_input; 818 ifp->if_resolvemulti = ether_resolvemulti; 819 if (ifp->if_baudrate == 0) 820 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 821 ifp->if_broadcastaddr = etherbroadcastaddr; 822 823 ifa = ifaddr_byindex(ifp->if_index); 824 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__)); 825 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 826 sdl->sdl_type = IFT_ETHER; 827 sdl->sdl_alen = ifp->if_addrlen; 828 bcopy(llc, LLADDR(sdl), ifp->if_addrlen); 829 /* 830 * XXX: This doesn't belong here; we do it until 831 * XXX: all drivers are cleaned up 832 */ 833 if (llc != IFP2AC(ifp)->ac_enaddr) 834 bcopy(llc, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 835 836 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 837 if (ng_ether_attach_p != NULL) 838 (*ng_ether_attach_p)(ifp); 839 if (BDG_LOADED) 840 bdgtakeifaces_ptr(); 841 842 /* Announce Ethernet MAC address if non-zero. */ 843 for (i = 0; i < ifp->if_addrlen; i++) 844 if (llc[i] != 0) 845 break; 846 if (i != ifp->if_addrlen) 847 if_printf(ifp, "Ethernet address: %6D\n", llc, ":"); 848 if (debug_mpsafenet && (ifp->if_flags & IFF_NEEDSGIANT) != 0) 849 if_printf(ifp, "if_start running deferred for Giant\n"); 850 } 851 852 /* 853 * Perform common duties while detaching an Ethernet interface 854 */ 855 void 856 ether_ifdetach(struct ifnet *ifp) 857 { 858 if (ng_ether_detach_p != NULL) 859 (*ng_ether_detach_p)(ifp); 860 bpfdetach(ifp); 861 if_detach(ifp); 862 if (BDG_LOADED) 863 bdgtakeifaces_ptr(); 864 } 865 866 SYSCTL_DECL(_net_link); 867 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 868 #if defined(INET) || defined(INET6) 869 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 870 ðer_ipfw,0,"Pass ether pkts through firewall"); 871 #endif 872 873 #if 0 874 /* 875 * This is for reference. We have a table-driven version 876 * of the little-endian crc32 generator, which is faster 877 * than the double-loop. 878 */ 879 uint32_t 880 ether_crc32_le(const uint8_t *buf, size_t len) 881 { 882 size_t i; 883 uint32_t crc; 884 int bit; 885 uint8_t data; 886 887 crc = 0xffffffff; /* initial value */ 888 889 for (i = 0; i < len; i++) { 890 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) 891 carry = (crc ^ data) & 1; 892 crc >>= 1; 893 if (carry) 894 crc = (crc ^ ETHER_CRC_POLY_LE); 895 } 896 897 return (crc); 898 } 899 #else 900 uint32_t 901 ether_crc32_le(const uint8_t *buf, size_t len) 902 { 903 static const uint32_t crctab[] = { 904 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 905 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 906 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 907 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 908 }; 909 size_t i; 910 uint32_t crc; 911 912 crc = 0xffffffff; /* initial value */ 913 914 for (i = 0; i < len; i++) { 915 crc ^= buf[i]; 916 crc = (crc >> 4) ^ crctab[crc & 0xf]; 917 crc = (crc >> 4) ^ crctab[crc & 0xf]; 918 } 919 920 return (crc); 921 } 922 #endif 923 924 uint32_t 925 ether_crc32_be(const uint8_t *buf, size_t len) 926 { 927 size_t i; 928 uint32_t crc, carry; 929 int bit; 930 uint8_t data; 931 932 crc = 0xffffffff; /* initial value */ 933 934 for (i = 0; i < len; i++) { 935 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) { 936 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01); 937 crc <<= 1; 938 if (carry) 939 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 940 } 941 } 942 943 return (crc); 944 } 945 946 int 947 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 948 { 949 struct ifaddr *ifa = (struct ifaddr *) data; 950 struct ifreq *ifr = (struct ifreq *) data; 951 int error = 0; 952 953 switch (command) { 954 case SIOCSIFADDR: 955 ifp->if_flags |= IFF_UP; 956 957 switch (ifa->ifa_addr->sa_family) { 958 #ifdef INET 959 case AF_INET: 960 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 961 arp_ifinit(ifp, ifa); 962 break; 963 #endif 964 #ifdef IPX 965 /* 966 * XXX - This code is probably wrong 967 */ 968 case AF_IPX: 969 { 970 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); 971 struct arpcom *ac = IFP2AC(ifp); 972 973 if (ipx_nullhost(*ina)) 974 ina->x_host = 975 *(union ipx_host *) 976 ac->ac_enaddr; 977 else { 978 bcopy((caddr_t) ina->x_host.c_host, 979 (caddr_t) ac->ac_enaddr, 980 sizeof(ac->ac_enaddr)); 981 } 982 983 /* 984 * Set new address 985 */ 986 ifp->if_init(ifp->if_softc); 987 break; 988 } 989 #endif 990 default: 991 ifp->if_init(ifp->if_softc); 992 break; 993 } 994 break; 995 996 case SIOCGIFADDR: 997 { 998 struct sockaddr *sa; 999 1000 sa = (struct sockaddr *) & ifr->ifr_data; 1001 bcopy(IFP2AC(ifp)->ac_enaddr, 1002 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 1003 } 1004 break; 1005 1006 case SIOCSIFMTU: 1007 /* 1008 * Set the interface MTU. 1009 */ 1010 if (ifr->ifr_mtu > ETHERMTU) { 1011 error = EINVAL; 1012 } else { 1013 ifp->if_mtu = ifr->ifr_mtu; 1014 } 1015 break; 1016 default: 1017 error = EINVAL; /* XXX netbsd has ENOTTY??? */ 1018 break; 1019 } 1020 return (error); 1021 } 1022 1023 static int 1024 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa, 1025 struct sockaddr *sa) 1026 { 1027 struct sockaddr_dl *sdl; 1028 #ifdef INET 1029 struct sockaddr_in *sin; 1030 #endif 1031 #ifdef INET6 1032 struct sockaddr_in6 *sin6; 1033 #endif 1034 u_char *e_addr; 1035 1036 switch(sa->sa_family) { 1037 case AF_LINK: 1038 /* 1039 * No mapping needed. Just check that it's a valid MC address. 1040 */ 1041 sdl = (struct sockaddr_dl *)sa; 1042 e_addr = LLADDR(sdl); 1043 if (!ETHER_IS_MULTICAST(e_addr)) 1044 return EADDRNOTAVAIL; 1045 *llsa = 0; 1046 return 0; 1047 1048 #ifdef INET 1049 case AF_INET: 1050 sin = (struct sockaddr_in *)sa; 1051 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 1052 return EADDRNOTAVAIL; 1053 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1054 M_WAITOK|M_ZERO); 1055 sdl->sdl_len = sizeof *sdl; 1056 sdl->sdl_family = AF_LINK; 1057 sdl->sdl_index = ifp->if_index; 1058 sdl->sdl_type = IFT_ETHER; 1059 sdl->sdl_alen = ETHER_ADDR_LEN; 1060 e_addr = LLADDR(sdl); 1061 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 1062 *llsa = (struct sockaddr *)sdl; 1063 return 0; 1064 #endif 1065 #ifdef INET6 1066 case AF_INET6: 1067 sin6 = (struct sockaddr_in6 *)sa; 1068 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1069 /* 1070 * An IP6 address of 0 means listen to all 1071 * of the Ethernet multicast address used for IP6. 1072 * (This is used for multicast routers.) 1073 */ 1074 ifp->if_flags |= IFF_ALLMULTI; 1075 *llsa = 0; 1076 return 0; 1077 } 1078 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1079 return EADDRNOTAVAIL; 1080 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1081 M_WAITOK|M_ZERO); 1082 sdl->sdl_len = sizeof *sdl; 1083 sdl->sdl_family = AF_LINK; 1084 sdl->sdl_index = ifp->if_index; 1085 sdl->sdl_type = IFT_ETHER; 1086 sdl->sdl_alen = ETHER_ADDR_LEN; 1087 e_addr = LLADDR(sdl); 1088 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1089 *llsa = (struct sockaddr *)sdl; 1090 return 0; 1091 #endif 1092 1093 default: 1094 /* 1095 * Well, the text isn't quite right, but it's the name 1096 * that counts... 1097 */ 1098 return EAFNOSUPPORT; 1099 } 1100 } 1101 1102 static moduledata_t ether_mod = { 1103 "ether", 1104 NULL, 1105 0 1106 }; 1107 1108 DECLARE_MODULE(ether, ether_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1109 MODULE_VERSION(ether, 1); 1110